Abstract
A statistical analysis on a database of pile loading test is carried out to obtain vertical spring constant for serviceability limit state design. A database of 133 vertical pile loading tests carried out in different locations in Japan is first screened for good quality tests including the ultimate load conditions. The load-displacement curves of the database after screening are then mathematically fitted to Weibull curves from which the vertical spring constant Kv0.33 is calculated (Kv0.33 is Kv at the ratio of load to ultimate load of 0.33). The best model for estimation of Kv0.33 based on the available soil and pile parameters that are regarded as significant explanatory variables is finally chosen with the uncertainties of the model.
